I think they are DJ/Home Theater amps. I'm not sure though, and I don't really know what difference it would make. Have you looked at Carvin DCM 1000? Its a bit more than you budgeted, but I think you'd be alot better off.

hmm, I looked at Carvin, and while it seems exactly what I want, and I havn't heard a single bad thing about their power amps, I wanted to get them, but they are that much more expensive. Used is my best bet, and there aren't many Carvins on Ebay.